Note 3 - Fair Value Measurements - Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Marketable Securities	$ 173,683	$ 83,239
Corporate Debt Securities [Member]
Marketable Securities	83,674	44,963
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable Securities	71,395	12,084
Certificates of Deposit [Member]
Marketable Securities	13,194	15,269
US Treasury Securities [Member]
Marketable Securities	1,678	4,399
Asset-Backed Securities [Member]
Marketable Securities	3,742	6,524
Fair Value, Recurring [Member]
Marketable Securities	3,742
Total assets	186,523	107,119
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Marketable Securities	83,674	44,963
Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable Securities	71,395	12,084
Fair Value, Recurring [Member] | Certificates of Deposit [Member]
Marketable Securities	13,194	15,269
Fair Value, Recurring [Member] | US Treasury Securities [Member]
Marketable Securities	1,678	4,399
Fair Value, Recurring [Member] | Asset-Backed Securities [Member]
Marketable Securities		6,524
Fair Value, Recurring [Member] | Money Market Funds [Member]
Money market funds (cash equivalents)	12,840	23,880
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Total assets	85,913	40,363
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable Securities	71,395	12,084
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Marketable Securities	1,678	4,399
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-Backed Securities [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Money market funds (cash equivalents)	12,840	23,880
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Total assets	100,610	66,756
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Marketable Securities	83,674	44,963
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member]
Marketable Securities	13,194	15,269
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-Backed Securities [Member]
Marketable Securities	3,742	6,524
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Money market funds (cash equivalents)	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Total assets	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-Backed Securities [Member]
Marketable Securities	0	0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
Money market funds (cash equivalents)	$ 0	$ 0